software.amazon.kinesis.coordinator.migration

Class MigrationReadyMonitor

java.lang.Object

software.amazon.kinesis.coordinator.migration.MigrationReadyMonitor

All Implemented Interfaces:

Runnable

@ThreadSafe
public class MigrationReadyMonitor
extends Object
implements Runnable

Monitor for KCL workers 3.x readiness. This monitor is started on all workers but only executed on the leader of the fleet. The leader determines 3.x readiness if GSI of the lease table is active and all lease owners are emitting WorkerMetricStats. The monitor performs this check periodically and will invoke callback if the readiness conditions are true. Monitor needs to be explicitly cancelled after the readiness trigger has successfully been handled. Thread safety - Guard for safety against public method invocation and internal runnable method.

Constructor Summary

Constructors

Constructor and Description
MigrationReadyMonitor(MetricsFactory metricsFactory, Callable<Long> timeProvider, LeaderDecider leaderDecider, String currentWorkerId, WorkerMetricStatsDAO workerMetricStatsDAO, long workerMetricsExpirySeconds, LeaseRefresher leaseRefresher, ScheduledExecutorService stateMachineThreadPool, Runnable callback, long callbackStabilizationInSeconds)

Method Summary

Modifier and Type	Method and Description
void	cancel() Cancel the monitor.
void	run()
void	startMonitor()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

MigrationReadyMonitor

public MigrationReadyMonitor(MetricsFactory metricsFactory,
                             Callable<Long> timeProvider,
                             LeaderDecider leaderDecider,
                             String currentWorkerId,
                             WorkerMetricStatsDAO workerMetricStatsDAO,
                             long workerMetricsExpirySeconds,
                             LeaseRefresher leaseRefresher,
                             ScheduledExecutorService stateMachineThreadPool,
                             Runnable callback,
                             long callbackStabilizationInSeconds)

Method Detail

startMonitor

public void startMonitor()

cancel

public void cancel()

Cancel the monitor. Once the method returns callback will not be invoked, but callback can be invoked reentrantly before this method returns.

run

public void run()

Specified by:

run in interface Runnable

toString

public String toString()

Overrides:

toString in class Object